Hand-brace.



PATENTED AUG. 13, 1907.

0. GRANUM.

HAND BRAGE. APPLIUATIONTILED 001211, 190e,

/m/f/v 70H @le grmuw *Im/M A TTOHNI YS UNITED STATES OLE GBANUM, OFAMERY, WISCONSIN.

HAND-BRACE Specification of Letters Patent.

Patented Aug. 13, 1907.

Application filed October 17, 1906. Serial No. 339,324.

To all whom "it may concern:

Be it known that I, OLE GRANUM, a citizen of the United States, and aresident of Amery, in the county of Polk and State of Wisconsin, haveinvented a new and Improved Hand-Brace, of which the following is afull, clear, and exact description.

The invention relates to boring and drilling and more particularly todrill braces, such as shown and described in the Letters Patent of theUnited States, No. 614,385, granted to me on November l5, 1898.

The object of the present invention is to provide a new and improvedhand-brace having a setting device to permit quick and convenientconverting of the brace into an ordinaryT crank-brace or aratchet-brace.

The invention consists of novel features and parts and combinations ofthe same which will be more fully described hereinafter and then pointedout in the claims.

A practical embodiment of the invention is represented in theaccompanying drawings forming a part of this specification, in whichsimilar characters of reference indicate corresponding parts in all theviews.

Figure l is a side elevation of the improvement; Fig. 2 is an enlargedsectional side elevation of the same; Fig. 3 is a cross section of thesame, on the line 3-#3 of Fig. 2; Figs. 4, 5, 6 and 7 are diagrammaticviews,

showing the pawls and cam-wheel in different positions relative to thepinion; Fig. 8 is a side elevation of one of the pawls; Fig. 9 is a sideelevation of the handle-shaft for carrying the cam; Fig. lO is a faceview of the same; Fig. il is an enlarged sectional side elevation of thelocking and releasing device for the gear wheel shaft, the said devicebeing in an open position; Fig. l2 is a sectional plan view of the samein a closed position; and Fig. 13 is accross section of the same.

The general construction of the hand-brace is similar to the one shownand described in the Letters Patent above referred to; that is, thehand-brace consists essentially of the operating crank A, in the heel Aof 'which is journaled the shank B of the stock or socket C, providedwith the usual clamping jaws D adapted to engage the tang of the `bit inthe usual manner. On the shank B is secured a pinion E in mesh with agear-wheel F secured on a shaft G, removably j ournaled in bearings Gand G2 arranged on a saddle G3 secured to the operating crank A, thesaid shaft G being normally held against removal by a manuallycontrolledlocking and releasing device hereinafter more fully described.

On the gear-wheel F is secured a handle H for turning the saidgear-wheel, and with it the pinion E, the shank B, stock O and the bitheld in the clamping jaws D. The pinion E is adapted to be engaged bypawls I and I fulcrumed at I2 and I3 on the heel A and pressed on attheir upper ends by a spring J to normally hold the lower ends of thesaid pawls I and I in mesh with the pinion E to cause the pinion to turnwith the operating crank A whenever the brace is to be used as anordinary crank-brace.

Either' or both of the pawls I and I may be thrown out of mesh with thepinion E, and for this purpose a setting device is provided, consistingessentially of a cam K in the form of a toothed wheel extending betweenthe opposite faces of the pawls I and I and secured on a shaft L mountedto turn in suitable bearings arranged on the heel A the outer end of thesaid shaft L carrying a handle N within convenient reach of the operatorfor turning the handle, and consequently the shaft L and the cam K to adesired position, as hereinafter more fully explained and illustrated inFigs. 3, 4, 5, 6 and 7.

The cam K is provided, on its peripheral face, with three teeth lK, i2and K3, and between the teeth K3 and K, opposite the tooth K3, isarranged a nontoothed portion K4, as plainly shown in Figs. 3 to 7,inclusive. The handle N preferably extends radially from the shaft L inalinement with the tooth K3, as indicated in the figures just mentioned.The opposite faces of the pawls I and I are provided with teeth IL andI3, operating in conjunction with the teeth K K2 and K3 and thenon-toothed portion Ki in a manner presently to be described.

When the handle N extends vertically downward, then the teeth K and K3extend horizontally and are in engagement with the teeth I" and I5 tohold the pawls I and I out of engagement with the pinion E, to allow ofturning the latter by means Aof the gearwheel F.

When the operator swings the handle N to the right or left, to either ofthe positions shown in Figs. 4 and 5, then both pawls I and I are heldin mesh with the pinion E by the action of the spring J, it beingunderstood that the cam K allows the pawls to pass into the closedposition mentioned, When the handle N is, however, thrown from itsvertical position into an approximately horizontal position to the left,as shown in Fig. 6, then the middle tooth K2 acts on the pawl I andthrows the same out of mesh with the pinion E, while the non-toothedportion K4 of the cam K extends between adjacent teeth I5 of the pawl I,thus allowing the pawl I to remain in mesh with the pinion E. When theseveral parts are in this position, the brace is used as aratchet-brace, to be turned from left to right.

When it is desired to use the brace as a ratchetbrace to be turned fromthe right to the left, then the handle N is swung from a verticalposition to the right into an approximately horizontal position, asshown in Fig. 7, to throw the pawl I out of mesh with the pinion E andto allow the pawl I to remain in mesh with the said pinion. In this casethe middle tooth K2 engages the teeth I5 of the pawl I, While thenon-toothed portion K4 extends between the teeth I4 on the pawl I. It isunderstood that when the middle portion K4 of the cam K engages theteeth I4 or l5, as above described and shown in Figs. 7 and 6,respectively, then the corresponding pawl is held in mesh with thepinion to turn the same when the operating crank is turned, but is freeto glide over the teeth of the pinion E when the operating crank A is onVthe return or non-active stroke.

From the foregoing it will be seen that a single manually-controlledsetting device is employed for controlling and operating both pawls Iand If, to move either or both out of engagement with the pinion E andto allow the pawls to be moved into engagement with the said pinion bythe action of the spring J.

When the brace is to be used as a ratchet-brace, then the gear-wheel Fand its shaft G and handle H are removed, and for this purpose thelocking and releasing device for the gear wheel shaft G is moved by theoperator into an open position to allow withdrawal of the shaft G fromthe bearings G and G2.

The locking and releasing device for the gear-wheel shaft G is arrangedas follows: The gear-wheel shaft G is provided adjacent to its pointedouter end G4 with an annular groove G5 adapted to be engaged by clutchlevers P, P fulcrumed in the saddle G3 previously referred to. A lockinglever Q is provided with an offset Q adapted to pass between the freeends of the clutch levers P, P/ to normally hold the same againstswinging into an open position. Now when the operator swings the lever'Q upwardly into an open position as shown in Fig. ll, then the offset Q/moves out of engagement with the levers P, P to allow of the operator topress the free ends oi the said levers P, P toward each other todisengage the levers from the annular groove G5. The operator can nowpull the gear-wheel shaft G out of the bearings G', G2.

The device is very simple and durable in construction and not liable toget easily out of order.

Having thus described our invention, we claim as new and desire tosecure by Letters Patent 1. A controlling device for a brace, comprisinga pair of pivoted and spring pressed pawls adapted to engage a toothedrotatable part of the brace, the opposing faces of the pawls being eachprovided with a plurality of teeth, and a manually controlled camlocated between the said pawls and provided on its peripheral face witha plurality of teeth and a non-toothed portion for engagement with theteeth of the pawls.

2. A controlling device for a brace, comprising a pair of spring-pressedpawls adapted to engage a toothed ro tatable part of the brace, theopposing faces of the pawls being provided with a plurality of teeth,and a manuallycontrolled cam-wheel extending between the said pawls andhaving its peripheral face provided with three teeth and a non-toothedportion, for engagement with the teeth of the pawls, the non-toothedportion being located between two of said teeth and opposite theremaining tooth.

3. A brace, comprising an operating crank, a socket for carrying the bitand rotatably mounted in the said crank, a pinion secured to the saidsocket, a pair of springpressed pawls fulcrumed on the said operatingcrank and adapted to engage the said pinion, the said pawls beingprovided with a plurality of teeth on their opposing faces, and a wheelmounted to turn between the said pawls and having its peripheral faceprovided with three teeth, and a non-toothed portion for engagement withthe teeth of the pawls, the non-toothed portion being located betweentwo of said teeth and opposite the remaining tooth.

4. A brace comprising an operating crank, a socket for carrying the bitand provided with a shank 'rotatably mounted in the said crank, a pinionsecured to the said shank of the socket, a pair of spring-pressed pawlsfulcrumed on the heel of said operating crank and extending parallelwith the said shank, the said pawls being'adapted to engage the saidpinion and provided with teeth on their opposing faces, a shaft mountedto turn in bearings on the heel ot" said crank and provided at itsouter' end with a handle, the said shaft extending between the saidpawls, and a cam secured on said shaft and having its peripheral faceprovided with three teeth and a non toothed portion for engagement withthe teeth of the pawls, two of said teeth being opposite each other, thenontoothed portion and the remaining tooth being opposite each other andsubstantially at right angles to the first mentioned teeth.

A brace comprising an operating crank, a socket for carrying the bit androtatably mounted in the said crank, a pinion secured on the saidsocket, pawls adapted to engage the said pinion, the opposing faces ofthe pawls being provided with a plurality of teeth, a cam wheel mountedto turn between the pawls, the said cam wheel being provided on itsperiphery with three teeth and a non'- tootlied' portion for engagementwith the teeth of the,

pawls, two of said teeth being opposite each other and the remainingtooth and the non-toothed portion being opposite each other andextending at right angles to the first mentioned teeth, the said cambeing arranged to throw either or both pawls out of engagement with thepinion or to allow both pawls to engage said pinion.

In testimony whereof 1 have signed my name to this specification in thepresence of two subscribing witnesses.

OLE GRANUH. Witnesses W. W. WINcHnsTnn, .Tassin FERGUSON`

